TP439不锈钢在高温高压水中的应力腐蚀开裂行为
SCC Behavior of TP439 Stainless Steel in High Temperature and High Pressure Water
摘 要
采用扫描电镜、动电位极化曲线和慢应变速率试验研究了TP439不锈钢的组织形貌及其在高温高压水中的应力腐蚀开裂行为。结果表明：TP439不锈钢的微观组织为典型的铁素体等轴晶粒，晶内分布有一定数量的细小碳化物；3.5%(质量分数)NaCl溶液中,其腐蚀电位为-0.25 V(SCE,下同),点蚀电位约为0.18 V;三种温度条件下铁素体不锈钢的慢应变拉伸曲线相似，断口形貌主要为韧性断口;温度对铁素体不锈钢在高温高压水中应力腐蚀行为无明显影响，TP439不锈钢在此环境中的应力腐蚀敏感性较低。
高温高压水
应力腐蚀开裂
断口形貌
ferritic stainless steel
high temperature and high pressure water
stress corrosion cracking
fracture morphology
Abstract
The microstructure and stress corrosion cracking (SCC) behavior of TP439 ferrite stainless steel in high temperature and high pressure water were studied by scanning electron microscopy, potentiodynamic polarization curve, energy dispersive spectra and slow strain rate test (SSRT). The results showed that the microstructure of TP439 ferrite stainless steel presented ferritic grains and the particles of fine carbide were distributed; the potential of TP439 stainless steel in 3.5% NaCl was -0.25 V (SCE), and the pitting potential was 0.18 V(SCE). The stress vs strain curves of TP439 stainless steel at different temperatures were similar and their fracture morphology was ductile fracture. Temperature had no obvious effect on SCC and the TP439 stainless steel had the low susceptibility to SCC in high temperature and high pressure water.
中图分类号 TG172 DOI 10.11973/fsyfh-201609007
所属栏目 核电设备材料防护
基金项目 国家自然科学基金(U1260201)
收稿日期 2016/8/2
修改稿日期
网络出版日期
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备注李成涛(1980-),高级工程师,博士,从事核电金属材料高温高压水应力腐蚀行为研究。
引用该论文: XU Wei-min,ZHAN Jing,ZHANG Wei-xiao,LI Cheng-tao,FANG Ke-wei. SCC Behavior of TP439 Stainless Steel in High Temperature and High Pressure Water[J]. Corrosion & Protection, 2016, 37(9): 723
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参考文献
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【4】QU H P,LANG Y P,CHEN H T,et al. The effect of precipitation on microstructure,mechanic properties and corrosion resistance of two UNS S44660 ferritic stainless steels[J]. Materials Science and Engineering:A,2012,534:436-445.
【5】GONZALEZ-RODRIGUEZ J G,BAHENA-MARTINEZ G,SALINAS-BRAVO V M. Effect of heat treatment on the stress corrosion cracking behaviour of 403 stainless steel in NaCl at 95 ℃[J]. Materials Letters,2000,43(4):208-214.
【6】SHU J,BI H Y,XIN L,et al. The effect of copper andmolybdenum on pitting corrosion and stress corrosioncracking behavior of ultra-pure ferritic stainless steels[J]. Corrosion Science,2012,57:89-98.
【7】NAGE D D,RAJA V S. Effect of nitrogen addition on the stress corrosion cracking behavior of 904 L stainless steel welds in 288 ℃ deaerated water[J]. Corrosion Science,2006,48(8):2317-2331.
【8】杨瑞成，孟威，舒俊，等. 铁素体不锈钢热轧板材的拉伸行为和断裂特征[J]. 兰州理工大学学报，2008，34（6）：25-29.
【9】SUNG J H,KONG J H,YOO D K,et al. Phase changes of the AISI 430 ferritic stainless steels after high-temperature gas nitriding and tempering heat treatment[J]. Materials Science and Engineering:A,2008,489(1/2):38-43.
【10】WON-JIN B,KWI-SUB Y,CHAN-JIN P,et al. Comparison of influences of NaCl and CaCl2 on the corrosion of 11% and 17% Cr ferritic stainless steels during cyclic corrosion test[J]. Corrosion Science,2010,52(3):734-739.
【11】SEUNG U L,JAE C A,DONG H K,et al. Influence of chloride and bromide anions on localized corrosion of 15% Cr ferritic stainless steel[J]. Materials Science and Engineering:A,2006,434(1/2):155-159.
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【13】JE H,KIMURA A. Stress corrosion cracking susceptibility of oxide dispersion strengthened ferritic steel in supercritical pressurized water dissolved with different hydrogen and oxygen contents[J]. Corrosion Science,2014,78:193-199.
【14】VELASCO F,BAUTISTA A,GONZLEZ-CENTENO A. High-temperature oxidation and aqueous corrosion performance of ferritic,vacuum-sintered stainless steels prealloyed with Si[J]. Corrosion Science,2009,51(1):21-27.
【15】CHAN-JIN P,MYUNG-K A,HYUK-SANG K. The effect of copper and molybdenum on pitting corrosion and stress corrosion cracking behavior of ultra-pure ferritic stainless steels[J]. Corrosion Science,2012,57:89-98.
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